File servers. Everywhere I've worked for the past 5 years makes you use a cloud "solution" like DropBox or Google Drive. Those things are find for individual use, but a nightmare to work with in a team. "I'll share that doc with you." "I can't access it - can you give me permissions?" "OK what's your email address..." etc. I sure do miss the days when a) there was a common root directory that everyone could see and b) the issue of permissions wasn't crowd sourced to people who don't understand permissions systems.